3÷〔9×( 1 27 - 1 36 )〕×12

1个回答

  • (1)3÷[9×(

    1

    27 -

    1

    36 )]×12,

    =3÷[9×

    1

    27 -

    1

    36 ×9]×12,

    =3÷[

    1

    3 -

    1

    4 ]×12,

    =3 ÷

    1

    12 ×12,

    =36×12,

    =432;

    (2)93.6÷[(6-2.88)×( 5

    7

    8 -1.875)],

    =93.6÷[3.12×4],

    =93.6÷12.48,

    =7.5;

    (3)7.05×37+64×7.05-7.05,

    =7.05×(37+64-1),

    =7.05×100,

    =705;

    (4) (2

    2

    9 ×

    4

    5 +2

    2

    9 ×6.2-5.8×2

    2

    9 -

    1

    5 ÷

    9

    20 )×

    9

    20 ,

    =(

    20

    9 ×0.8+

    20

    9 ×6.2-5.8×

    20

    9 -

    20

    9 ×0.2)×

    9

    20 ,

    =[

    20

    9 ×(0.8+6.2-5.8-0.2)]×

    9

    20 ,

    =[

    20

    9 ×1]×

    9

    20 ,

    =

    20

    9 ×

    9

    20 ,

    =1;

    (5) 8

    4

    5 ÷[7.8+

    1

    4 ×(2.75+1.25)],

    = 8

    4

    5 ÷[7.8+

    1

    4 ×4],

    = 8

    4

    5 ÷(7.8+1),

    =8.8÷8.8,

    =1;

    (6)8.1÷( 4

    1

    7 -0.05×70 )÷ 1

    2

    7 ,

    =8.1÷(4

    1

    7 -3.5)÷ 1

    2

    7 ,

    =

    81

    10 ÷

    9

    14 ÷

    9

    7 ,

    =

    81

    10 ×

    14

    9 ×

    7

    9 ,

    =

    49

    5 .